WO2013019081A2

WO2013019081A2 - Wrench socket for automatic marking of high tension bolt, and method for coupling high tension bolt using same

Info

Publication number: WO2013019081A2
Application number: PCT/KR2012/006162
Authority: WO
Inventors: 김강석; 이용승; 나환선; 이현주
Original assignee: 한국전력공사
Priority date: 2011-08-02
Filing date: 2012-08-02
Publication date: 2013-02-07
Also published as: WO2013019081A3; KR101342412B1; US9393679B2; US20140165795A1; KR20130015044A

Abstract

The present invention provides a wrench socket and a method for coupling a high tension bolt. The present invention includes: a housing, in contact with a portion of a nut, which applies force to the nut and is mounted to a handle so as to be rotatable; a marking unit which is provided in the housing and marks lines on a high tension bolt, the nut and a washer according to the height of the high tension bolt; a gauge unit, in contact with the high tension bolt, which is provided in the housing so as to be able to move back and forth according to the position of the high tension bolt; and an elastic unit which applies elastic force to the gauge unit according to the position of the gauge unit.

Description

High-strength bolt automatic gold wrench wrench socket, fastening bolts using it

The present invention relates to a wrench socket and a fastening method, and more particularly, to a wrench socket for a high-voltage bolt automatic locking and a high-strength bolt fastening method using the same.

High strength bolts are mainly used for joining construction and civil steel structures. The fastening method of the high-strength bolt is mainly used in the United States, Europe, and torque management method is used in Japan and Korea. In the case of the torque management method, the required torque is determined by a test on five or more bolts in the same bolt group on the day of the field tightening, and the bolts are fastened to the value. In addition, the torque management method is easier to construct the site than the nut rotation method, it is affected by the on-site conditions, such as the day temperature, humidity, thread state of the bolt and nut. In fact, in the process of changing the torque coefficient from 0.11 to 0.19, the axial force can be tightened to 58% of the target axial force.

Therefore, it is prescribed in the construction standard to inspect the bolt rotation after the first tightening of the bolt and nut and to inspect the nut rotation angle (passing range 120˚ ± 30˚) required after the tightening. However, it is rarely done because gold grading works on individual high-strength bolts at construction sites where thousands of tens of thousands of high-voltage bolts are fastened.

Meanwhile, in order to solve the above problems, various technologies have been developed at home and abroad to improve the quality of high-strength bolt tightening axial force. Typical devices are sensing and checking axial force. There are many other new technologies, but most of them are economically expensive to apply in the field and are rarely used. In addition, in the United States, when the washer reaches the target axial force, the protrusion of the washer is plastically deformed, and a special washer is used to indicate the completion of the tightening. On the other hand, in recent domestic construction sites, torque-shear type high-strength bolts are mainly used to indicate the end of tightening by breaking the end of the bolt when a certain torque is reached.In addition, the pin tail is prematurely broken due to the change of torque coefficient, resulting in the introduction of axial force. In some cases, it needs to be managed separately.

As described above, in most fastening methods such as nut rotation method, torque management method, and torque-shear high-strength bolt fastening method, the nut rotation angle is used as an inspection criterion after tightening. There is no way to inspect after signing because the gold pawl has not been implemented after the signing.

Embodiments of the present invention to provide a high-strength bolt automatic gold wrench wrench socket and a high-strength bolt fastening method using the same that can be confirmed by fastening the automatic bolt when the high-strength bolt is installed.

One aspect of the present invention is a housing, which is in contact with a part of the nut to apply a force to the nut, rotatably installed on the handle, and the high-strength bolt, the nut and according to the height of the high-strength bolt installed in the housing A gold-engaging portion for locking the washer, a gauge portion installed in the housing so as to be reciprocated according to the position of the high-strength bolt in contact with the high-strength bolt, and an elastic force providing elasticity to the gauge portion according to the position of the gauge portion. It is possible to provide a wrench socket including a part.

The apparatus may further include a position detecting unit installed in the housing to detect a position of the gauge unit.

In addition, the gold binding portion is disposed in the housing to store the ink, the ink storage unit for supplying the ink to the outside according to the position of the gauge portion detected by the position sensing unit and the ink stored in the ink storage unit It may be provided with an ink rod for flowing the gold by spraying the ink to the high-strength bolt, the nut and the washer.

The ink storage unit may supply the ink to the ink rod for a predetermined time when the position change of the gauge unit detected by the position sensing unit is a first length.

The display apparatus may further include a marking unit installed in the housing to recognize the fastening force of the high-strength bolt as an image or sound according to the position of the gauge unit detected by the position detecting unit.

In addition, when the position change of the gauge portion detected by the position sensing unit is greater than or equal to the second length, the fastening completion of the high-strength bolt may be expressed to the outside.

The apparatus may further include a magnetic part installed in the housing and attached to the washer by magnetic force.

The apparatus may further include an outer case disposed outside the housing to be fixed to the handle part.

The apparatus may further include an input unit installed in the housing to input a type of the high force bolt.

According to another aspect of the present invention, by inserting a nut inserted into the high-strength bolt into the housing to rotate the first angle and then check whether the position change of the gauge portion in contact with the high-strength bolt is the first length to fasten the nut to the high-strength bolt first And a second step of locking the gold bolt to the high-strength bolt, the nut and the washer when the position change of the gauge portion detected by the position sensing unit is a first length. Provides a high-strength bolt fastening method comprising a third step of expressing the fastening completion of the high-strength bolt body in the cover part when the position change of the gauge portion detected by the position sensing unit after the second angle rotates the second length can do.

The method may further include inputting a type of the high-strength bolt through an input unit before the first step.

Embodiments of the present invention can be automatically gold-set according to the installation degree of the high-strength bolt, and can check the fastening force of the high-strength bolt through the display unit can increase the user's convenience and provide the optimum high-strength tightening force .

1 is a cross-sectional view showing a wrench socket according to an embodiment of the present invention.

2 is a cross-sectional view showing a wrench socket according to another embodiment of the present invention.

Figure 3 (a) shows the relationship between the tightening axial force and the torque of the present invention, Figure 3 (b) is a graph showing the relationship between the tightening axial force and the nut rotation angle.

1 is a cross-sectional view showing a wrench socket 100 according to an embodiment of the present invention.

Referring to FIG. 1, the wrench socket 100 includes a housing 110 in contact with the nut N to apply a force to the nut N. At this time, the housing 110 may be rotatably installed in the handle portion (H). Therefore, the housing 110 may rotate the housing 110 when the handle portion H rotates. In particular, the housing 110 may be installed to rotate only in one direction to the handle (H).

In detail, when the handle portion H is rotated in one direction, the housing 110 may rotate together with the handle portion H. In addition, when rotating the handle portion H in the other direction, the housing 110 may be fixed together with the nut (N) without rotating with the handle portion (H).

For example, when the handle portion H is rotated in the clockwise direction, the housing 110 is fixed to the handle portion H, and the nut N is turned clockwise by a force applied to the handle portion H. Can be rotated. In addition, when the handle portion H is rotated in the counterclockwise direction, the housing 110 is not fixed to the handle portion H so that only the handle portion H may rotate about the housing 110. The operation as described above is only one embodiment and the handle portion (H) and the housing 110 can be relative movement in various ways.

On the other hand, the wrench socket 100 includes a gold engaging portion 130 is installed in the housing 110. The gold pawl 130 may gold the high-strength bolt (B), the nut (N) and the washer (W) according to the height of the high-strength bolt (B). Specifically, the gold pawls 130 are sprayed on the outer surface of the high-strength bolt (B), nut (N) and washer (W) according to the height of the high-strength bolt (B), high-strength bolt (B), nut (N) and The washer (W) can be golded.

In this case, the gold pawl 130 may include an ink storage 131 disposed in the housing 110 to store ink. The ink storage unit 131 may supply ink to the outside according to the position of the gauge unit 120 to be described later detected by the position detecting unit 150 to be described later.

The gold pawler 130 may include an ink rod 132 through which the ink stored in the ink reservoir 131 flows. At this time, the ink rod 132 may eject the ink to the high-strength bolt (B), nut (N) and washer (W). In detail, an ink flow hole 132a may be formed in the ink rod 132 so that ink is injected to the outside.

On the other hand, the wrench socket 100 includes a gauge portion 120 in contact with the high force bolt (B) to reciprocate according to the position of the high force bolt (B). Gauge portion 120 is installed in the housing 110 may be variable in height in accordance with the position change of the high-strength bolt (B).

At this time, the gauge unit 120 may be inserted into the housing 110 to reciprocate, and may be formed such that one end thereof is in point contact with the outer surface of the high-strength bolt (B).

The wrench socket 100 includes an elastic part 140 that provides an elastic force to the gauge part 120 according to the position of the gauge part 120. The elastic part 140 may be formed in various forms. For example, the elastic part 140 may be formed of a rubber material. In addition, the elastic unit 140 may be formed of a spring. Hereinafter, for convenience of description, the elastic part 140 will be described based on the case where the spring is formed.

On the other hand, the wrench socket 100 may be installed in the housing 110 may include a position detecting unit 150 for detecting the position of the gauge unit 120. In this case, the position sensing unit 150 may be formed in various forms. For example, the position detecting unit 150 may be formed in a switch form that is turned on / off according to the position of the gauge unit 120. In addition, the position detection unit 150 may be formed in the form of measuring the displacement by detecting a change in the magnetic field according to the height of the gauge unit 120.

Specifically, when the position sensing unit 150 is formed in the form of a switch, the position sensing unit 150 is the first switch unit installed in the housing 110 to detect that the position change of the gauge unit 120 is the first length. 151 may be included. In addition, the position sensing unit 150 may include a second switch unit 152 installed in the housing 110 to detect that the position change of the gauge unit 120 is the second length.

In addition, when the position detecting unit 150 detects a magnetic field change and measures displacement, the position detecting unit 150 may include a magnet unit (not shown) installed in the gauge unit 120 to emit a magnetic field to the outside. Can be. The position detecting unit 150 may include a magnetic field measuring unit (not shown) installed in the housing 110 to measure a magnetic field emitted from the magnet unit.

At this time, the position detecting unit 150 may include any type of device for detecting the position change of the gauge unit 120 without being limited to the above. However, hereinafter, the position detecting unit 150 will be described based on the case where the first switch unit 151 and the second switch unit 152 are included for convenience of description.

On the other hand, the wrench socket 100 may include a marker portion 160 for recognizing the fastening force of the high-strength bolt (B) by the image or sound in accordance with the gauge unit 120 sensed by the position detection unit 150. In this case, the cover unit 160 may be installed on the outer surface of the housing 110.

In particular, the cover unit 160 may include a display unit (not shown) for recognizing the fastening force of the high-strength bolt (B) as an image. In addition, the cover unit 160 may include a voice label unit 160 for recognizing the fastening force of the high-strength bolt (B) by voice.

In this case, when the position change of the gauge unit 120 sensed by the position detecting unit 150 is greater than or equal to the second length, the cover unit 160 may express the completion of fastening of the high-strength bolt B to the outside. Therefore, the cover unit 160 may provide an optimal high force bolt (B) fastening force by recognizing the completion of the high force bolt (B) to the external user.

Meanwhile, the wrench socket 100 may include a magnetic part 170 installed in the housing 110. In this case, the magnetic unit 170 may be attached to the washer (W) by the magnetic force to fix the housing 110.

Wrench socket 100 may be installed in the housing 110 may include an input unit (not shown) for inputting the type of high-voltage bolt (B). In this case, when the type of high-strength bolt B is input from the input unit, the fastening force according to the type of the high-strength bolt B may be displayed from the cover unit 160 to the outside. In addition, when the type of the high force bolt (B) is selected in the input unit, the size and type of the high force bolt (B) can be determined.

On the other hand, the operation of the wrench socket 100 will be described in detail below.

1. Step of inputting the type of high-strength bolt

Before the housing 110 is inserted into the nut N, the type of the high force bolt B may be input through the input unit. In this case, the input unit may be formed in various ways such as a dial type or a touch panel type.

In the case of inputting the type of high-strength bolt (B) through the input unit, for installing the high-strength bolt (B), such as the fastening force according to the type of high-strength bolt (B), high-force bolt (B) in the cover portion 160 Various information can be expressed.

In addition, when inputting the type of high-strength bolt (B) through the input unit, a suitable fastening force can be set according to the type of high-strength bolt (B). Specifically, the fastening force according to the type of the high force bolt (B) is pre-set in the form of a table when the type of high force bolt (B) through the input unit may be automatically set the fastening force.

At this time, the fastening force according to the type of high-strength bolt (B) is a table may be stored in a separate storage device or a controller (not shown).

2. first step;

After inputting the kind of high-strength bolt (B) through the input unit, by inserting the nut (N) to the high-strength bolt (B) it can be rotated by the nut (N) by hand. In this case, when the nut N is inserted into the high-strength bolt B to a predetermined degree, the housing 110 may be disposed on the outer surface of the nut N such that the nut N is inserted into the housing 110.

In this case, when a force is applied through the handle portion H, the force may be transmitted to the housing 110. The housing 110 rotates together with the handle portion H by the force, and the housing 110 may rotate the nut N while rotating. At this time, the magnetic unit 170 may be attached to the washer (W) and rotated together with the housing 110 while being dropped.

When the nut N rotates together with the housing 110, the nut N may be rotated by a first angle. At this time, one end of the high-strength bolt (B) in accordance with the rotation of the nut (N) may protrude to the outside of the nut (N).

One end of the high-strength bolt (B) is in contact with the gauge portion 120 while protruding out of the nut (N), the gauge portion 120 is variable in position. At this time, the gauge unit 120 may be drawn into the housing 110 according to the movement of the nut (N).

When the gauge unit 120 continues to draw into the housing 110 and the position change of the gauge unit 120 becomes the first length ΔL ₁ , the gauge unit 120 opens the first switch unit 151. It can work. In this case, the elastic unit 140 may provide an elastic force to the first gauge unit 120. Therefore, the gauge unit 120 may receive a restoring force in the direction opposite to the movement direction by the elastic unit 140.

Meanwhile, as described above, the first length ΔL ₁ may be calculated according to the type of the high-strength bolt B, respectively. In detail, the first length ΔL ₁ may be stored in the storage device or the control unit according to the type of the high-strength bolt B as described above.

Looking at the method of calculating the first length ΔL ₁ , the fastening force of the high-strength bolt B can be calculated by calculating the forward length of the high-strength bolt B during one rotation of the nut N. Specifically, in the process of fastening the high-strength bolt (B) and the nut (N), the forward length of the high-strength bolt (B) and the rising length (ΔL) of the end of the high-strength bolt (B) is the same, the rising length (ΔL) is It can only be determined by the rotation angle of the nut (N).

The angle of rotation of the nut (N) is specified in the general specification (KS B 0201 metric ordinary thread) for all bolts, including high-strength bolts (B). By deriving the rotation angle at each tightening force point from the relationship between the tightening force and the rotation angle of the nut N, the rising length ΔL of the high-strength bolt B can be calculated from the relationship between the rotation angle of the lead and the nut N. In this case, the rising length ΔL of the high-strength bolt B may be calculated in advance as described above and stored in the storage device or the controller.

On the other hand, when looking at the rising length (ΔL) calculated in detail as described above, in the case of the general hexagonal high-strength bolt (diameter 20mm, length 140mm, pitch 2.5mm) corresponding to KS B 1010, the first length (ΔL ₁ ) is calculated can do. Specifically, the first length ΔL ₁ calculated in the first step may be calculated from the following torque-fastening force relationship and the rotation angle-fastening force relationship of the nut N.

At this time, as shown in Figure 3, the torque-tightening force relationship (Fig. 3 (a)) and the rotation angle-tightening force relationship (Fig. 3 (b)) of the nut (N) are respectively tabulated by the experiment or the like in the form of data It may be stored in the storage device or the controller.

On the other hand, the tightening reference torque required in the first step for the general hexagonal high-strength bolt corresponding to KS B 1010 is 150Nm. (At this time, the tightening reference torque is set to the design standard of F10T grade high-strength bolt, diameter 20mm to 150Nm. .)

In addition, when the fastening reference torque is calculated from the graph shown in FIG. 3 (a), the fastening force may be 45 kN. In addition, referring to Figure 3 (b), the rotation angle of the nut (N) with respect to the fastening force 45kN may be 45 °.

Since the pitch is 20 mm based on the above, the first length ΔL ₁ for the rotation angle 45 ° may be calculated through a proportional expression. Specifically, when the pitch is 20 mm, the first length ΔL ₁ for the rotation angle 45 ° may be calculated as 0.35 mm by the formula 360: 45 = 20: x.

Therefore, the user can easily calculate the first length ΔL ₁ through the graph and the proportional equation shown in FIG. 3, and the position change of the high-strength bolt B is stored because the first calculated length ΔL ₁ is stored. By simply measuring the nut (N) to the high-strength bolt (B) can be confirmed whether the primary fastening.

On the other hand, the data for the first length (ΔL ₁ ) as described above may be data for each type of high-voltage bolt (B) may be stored in the storage device or the controller. Therefore, when the type of the high-strength bolt B is selected through the input unit, the first length ΔL ₁ according to the type of the high-strength bolt B is transmitted to the first switch unit 151 so that the gauge unit 120 It can be confirmed whether the position change is equal to the first length ΔL ₁ .

3. second step;

As described above, when it is determined that the position change of the gauge unit 120 is the first length ΔL _{1 in} the first switch unit 151, the first switch unit 151 may draw ink in the ink storage unit 131. A signal may be transmitted to the ink reservoir 131 to emit.

In this case, an opening may be formed in the ink storage unit 131 to discharge ink to the outside according to a signal of the first switch unit 151, and an opening and closing device such as a solenoid valve may be installed in the opening.

Meanwhile, the spilled ink may flow from the ink storage 131 to the ink rod 132. Ink flowing into the ink rod 132 flows inside the ink rod 132 and may be discharged to the outside through the ink flow hole 132a.

The ink discharged to the outside through the ink flow hole 132a may be adhered to the outer surface of the high-strength bolt B, the nut N, and the washer W to be gold-plated.

4. third step;

On the other hand, when the gold is completed as described above, the user can continue to couple the nut (N) to the high-strength bolt (B) through the handle (H). At this time, the handle portion (H) may rotate the housing 110 while rotating.

The housing 110 rotates the nut (N) while rotating, and one end of the high-strength bolt (B) may continue to protrude out of the nut (N). In this case, the magnetic unit 170 may rotate together with the housing 110 as described above.

On the other hand, when the housing 110 is rotated as described above, the nut (N) may be continuously rotated to be main body fastened to the high-strength bolt (B). Specifically, after the nut N is rotated by the second angle to the housing 110, when the position change of the gauge part 120 is the second length ΔL ₂ , the fastening of the high-strength bolt B is completed at the cover part 160. Can be expressed.

In this case, the method of calculating the second length ΔL ₂ may be similar to the method of calculating the first length ΔL ₁ . Specifically, in the case of body tightening, whether or not the body fastening may be determined according to the fastening force between the nut (N) and the high-strength bolt (B).

Specifically, the second length ΔL ₂ may be determined according to the fastening force of the high-strength bolt (B). For example, referring to FIG. 3 as described in the second step, when using the same high-strength bolt (B) it can determine the rotation angle of the nut (N).

The same high-strength bolt B as described in the second step may have a target fastening force of 178 kN. At this time, it can be seen that the rotation angle of the nut (N) corresponding to 178 kN from Figure 3 (b).

Meanwhile, as described above, when the rotation angle of the nut N is 167 °, the second length ΔL ₂ may be calculated as 1.16 mm by a proportional expression. In this case, the second length ΔL ₂ may be stored in the storage device or the controller in a tabled state similarly to the first length ΔL ₁ .

Accordingly, the second length ΔL ₂ may be automatically calculated and determined when the type of the high-strength bolt B is determined by the input unit.

Meanwhile, when the second length ΔL ₂ is determined as described above, the second switch unit 152 may detect whether the position change of the gauge unit 120 is the second length ΔL ₂ . Specifically, when the position of the gauge unit 120 varies according to the rotation of the nut N, it may be determined whether the position change of the gauge unit 120 is the second length ΔL ₂ .

If it is determined that the position change of the gauge unit 120 is greater than or equal to the second length ΔL ₂ , the second switch unit 152 may operate the indicator unit 160. At this time, the cover portion 160 may express the completion of the fastening bolt (B).

Therefore, the wrench socket 100 may automatically increase the user's convenience after the first fastening operation is completed based on the rising length ΔL of the end portion of the high-strength bolt B that is raised. .

In addition, the wrench socket 100 can simultaneously perform the first fastening and the pagination work, it is possible to shorten the working time and effective quality control.

Wrench socket 100 can be easily confirmed through the cover portion 160 to determine whether the body fastening is performed after the first fastening, and the body fastening by measuring the rise length (ΔL) associated with the fastening force is not affected by environmental factors Since it is possible to manage the fastening force of the high-strength bolt (B) constantly, it can be expected to improve the fastening quality.

2 is a cross-sectional view showing a wrench socket 200 according to another embodiment of the present invention.

Referring to FIG. 2, the wrench socket 200 may include a housing 210, a gold fitting portion 230, a gauge portion 220, an elastic portion 240, a position detecting portion 250, and a mark portion 260. Can be. In addition, the gold pawling 230 may include an ink reservoir 231 and an ink rod 232. In this case, the housing 210, the gold pawling part 230, the gauge part 220, the elastic part 240, the position detecting part 250, the cover part 260, the ink storage part 231, and the ink rod 232. Since is similar to that described in FIG. 1, detailed description thereof will be omitted below.

The wrench socket 200 may include an outer case 280 disposed outside the housing 210. At this time, the outer case 280 may be installed to be fixed to the handle (H). In addition, the outer case 280 may prevent the housing 210 from leaving the nut (N) in contact with the surface of the outer plate, such as when applying a force to the handle (H).

On the other hand, looking at the operation of the wrench socket 200, it can be performed similar to that described in Figure 1 will be omitted a detailed description.

Therefore, the wrench socket 200 is automatically gold-plated after the first tightening operation based on whether the rising length ΔL of the end portion of the wrench bolt 200 that reaches the first length ΔL ₁ as the high-strength bolt B is fastened. Since it can be completed, the user's convenience can be increased.

In addition, since the wrench socket 200 can perform the first fastening and the gold-finding work at the same time, it is possible to shorten the working time and effective quality control.

Wrench socket 200 can be easily confirmed through the cover portion 260 whether the main body fastening is performed after the first fastening, and the rising length by measuring the rising length (ΔL) associated with the fastening force is not affected by environmental factors Since (ΔL) reaches the second length (ΔL ₂ ), it is checked whether the body is fastened, and therefore, the fastening force of the high-strength bolt (B) can be managed constantly, so that the fastening quality can be expected to be improved.

In particular, the wrench socket 200 may be stably performed because the housing 210 is not separated by the outer case 280 when the high-strength bolt B and the nut N are coupled to each other.

As mentioned above, although embodiment of this invention was described, the person of ordinary skill in the art should add, change, delete, add, etc. the component within the range which does not deviate from the idea of this invention described in the claim. The present invention may be modified and changed in various ways, which will also be included within the scope of the present invention.

Claims

A housing in contact with the nut to apply a force to the nut, the housing being rotatably installed on the handle;

A gold engaging portion installed in the housing to gold the high force bolt, the nut and the washer according to the height of the high force bolt,

A gauge part installed in the housing to contact the high force bolt and to be reciprocated according to the position of the high force bolt;

Wrench socket including an elastic portion for providing an elastic force to the gauge portion in accordance with the position of the gauge portion.
The method according to claim 1,

Wrench socket installed on the housing further comprises a position detecting unit for detecting the position of the gauge.
The method according to claim 2,

The gold portion,

An ink storage unit disposed in the housing to store ink and supplying the ink to the outside according to the position of the gauge unit detected by the position detecting unit;

And an ink rod which flows the ink stored in the ink storage unit and jets the ink to the high-strength bolt, the nut, and the washer to lock the ink.
The method according to claim 3,

And the ink storage portion supplies the ink to the ink rod for a predetermined time when the position change of the gauge portion detected by the position sensing portion is a first length.
The method according to claim 2,

Wrench socket further comprising a cover portion installed in the housing to recognize the fastening force of the high-strength bolt in the image or sound according to the position of the gauge portion detected by the position detecting unit.
The method according to claim 5,

The marker portion wrench socket for expressing the completion of the fastening of the high-strength bolt to the outside when the position change of the gauge portion detected by the position sensing unit is more than a second length.
The method according to claim 1,

And a magnetic part installed on the housing and attached to the washer by magnetic force.
The method according to claim 1,

It is disposed on the outside of the housing is a high-power bolt automatic gold wrench wrench further comprises an outer case installed to be fixed to the handle portion.
The method according to claim 1,

The high-voltage bolt automatic gold wrench wrench is installed on the housing further comprises an input unit for inputting the type of the high-voltage bolt.
Inserting a nut inserted into the high-strength bolt into the housing to rotate the first angle, and then confirming that the position change of the gauge portion in contact with the high-strength bolt is of a first length to first fasten the nut to the high-strength bolt;

A second step of gilding the high-strength bolt, the nut and the washer when the position change of the gauge detected by the position sensing unit is a first length; And

A third step of expressing the fastening completion of the high-strength bolt on the cover part and then tightening the nut when the position change of the gauge part detected by the position detecting unit is the second length after the nut is rotated by the housing at a second angle; High strength bolt fastening method comprising.
The method according to claim 10,

And inputting a type of the high force bolt through an input unit before the first step.